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在德国70年代地下工程发展很快,他们以1985年为目标,讨论了以下三方面的问题: 1.隧道衬砌,特别是钢筋混凝土衬砌。2.混凝土弓形衬砌接合密封的防水考虑。3.隧道费用和影响它们的最重要因素。衬砌:
Underground engineering in Germany developed rapidly in the 1970s. They aimed at 1985 and discussed the following three issues: 1. Tunnel linings, especially reinforced concrete linings. 2. Concrete arch lining waterproof sealing consideration. 3. Tunnel costs and the most important factor affecting them. Lining: